Windolf J, Tornbjerg H, Hoffmann C, Poulsen J, Blicher Mathiesen G, Kronvang B. Successful reduction of diffuse nitrogen emissions at catchment scale: example from the pilot River Odense, Denmark. Water Sci Technol. 2016;73:2583-9 pubmed publisher
..In total, the N load in the River Odense has been reduced by 377 t N yr(-1) (39%) since 2000. The observed downward trend is supported by monitoring data from two wetlands restored in 2001 and 2004 in the River Odense catchment. ..